Crossing a sweet pea with a white flower (AAbb) with another white flower (aaBB) resulted in an F1 line with purple flowers (AaBb). Self-fertilization between purple (AaBb) flowers in the F1 progeny resulted in 9 purple and 7 white flowers in the F2 progeny.
here,
The first white flower genotype is AAbb
The second white flower genotype is aaBB
The first progeny is F1 and the second progeny is F2
Parents : ♂ × ♀
Phenotype: White flowers White flowers
Genotype : AAbb aaBB
Gamit : (Ab) (aB)
F1 Lineage : AaBb (Purple)
Self fertilization : F1×F1
Parents : ♂ × ♀
Phenotype: Purple flowers Purple flowers
Genotype : AaBb AaBb
Gamit : (AB)(Ab)(aB)(ab) (AB)(Ab)(aB) (ab)
F2 progeny (checker board)
Comment: From the checker board, out of 16 flowers, 9 are purple and 7 are white. The purple color of the flower is due to the combined effect of expressed genes A and B.
Phenotypic ratio : Purple : White = 9 : 7